Power surges or noise, on rare occasion, can cause the internal micro-controller(s) to inadvertently enter programming mode and wreak havoc within the equipment. A basic description of the problem which affects version 1 and version 2 hardware sold prior to September 2014 can be read on the Microchip support forum along my comment on the issue here, RE3 Problem

Customers who are not comforatable at making modifications themselves, and who have not yet returned their units for repairs as per Technical Service Bulletin 1, below, are encouraged to return their units to us, the manufacturer, for all needed service updates and recalibration at no charge. Please contact us to make arrangements at your convenience as customers need only pay shipping costs to and from our Canadian location.

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Energy Storage Instruments Inc.

Energy Storage Instruments Inc. is a privately held Ontario corporation established in 1995, and incorporated in 1999, specialized in power electronics design and manufacturing of standard and custom battery analyzer, battery charger and battery tester equipment for secondary rechargeable batteries.